Go ahead, Paula, give it a try. Sounds interesting. Would you stand the tire upright or lay it down? If upright, the vine would have more room to grow upward. If you succeed with this, please post a pic. You have a great imagination.
I had a large wrought iron birdcage and my niece put it in her yard sale and a woman bought it saying she was going to grow a plant thru the bars. OMG, why didn't I think of this? It would have looked great sitting next to my lily bed.